Pharmacology
Absorption
Bioavailability: Absolute bioavailability unknownPeak Plasma Time: 4-5 hrPeak Plasma Concentration: 80 ng/mL (mean)AUC: 2397 ng•h/mL (mean)Food: Exposure ~40% lower when taken in a fasted condition as compared to a normal caloric meal (533 kcal) or high-fat high-caloric meal (928 kcal); when taken with only a protein-rich nutritional drink, exposures were 50% lower than when taken with a meal
Distribution
Protein Bound: 99.7% (primarily to albumin)
Metabolism
Metabolized primarily by CYP3A
Elimination
Half-life: 50 hrExcretion: feces (85%), urine (6.1%) bile, other
Mechanism of Action
Antiviral agent; diarylpyrimidine non-nucleoside reverse transcriptase inhibitor (NNRTI) of HIV-1Inhibits HIV-1 replication by noncompetitive inhibition of HIV-1 reverse transcriptaseDoes not inhibit the human cellular DNA polymerases alpha, beta, and gamma